Press for metal tubes or sheathings



DEC. 29, G A

PRESS FOR METAL TUBES OR SHEATHINGS Filed 001;. 13, 1950 Fig. 2..

. end surfaces of the press pistons are dis- Patented Dec. 29, 1931 umrso STATES PATENT OFFICE GEORG OF COLOGNE, GERMANY, ASSIGIN'OR TO FELTEN & GUILLEAUMECARLS- WERK ACTIEN-GESELLSCHAFT, OF GOLOGNE-MULHEIM, GERMANY PRESS FOR METAL TUBES OR SHEATHINGS Application filed October 13, 1930, Serial No.

This invention relates to an improvement in presses with at least two press cylinders for the production of metal sheathings or tubes, more particularly lead cable sheathings.

According to the present invention the placed relatively to one another and similarly the filling openings of the press cylinders, the extent of the displacement between the said end surfaces being the same as the extent of displacement between the said filling openings.

Figs. 1 and 2 of the accompanying drawings illustrate, in sections taken at right angles to one another along the lines y-y and al -00 respectively, a press with two press pistons constructed according to the present invention and intended, for instance, for the sheathing of a cable core with a lead sheathing. a and b are the press pistons which are provided on the transverse head of the press.

c and d are the press cylinders and e and f show the extent of the displacement between the filling openings of the press cylinders on the one hand and the end surfaces of the press pistons on the other hand. The plunging of the press pistons a and 7) into the press cy inders 0 and d is effected in a known manner by means of water under pressure, which is supplied to the hydraulic plunger g, the plunging of the press pistons taking place simultaneously. The metal streams which are pressed out of the two cylinders c and d impinge on one another during the pressing in an annular chamber '11 which surrounds the mandrel h and pass out of the press through an opening which is formed by the mandrel h and a ring is. The cable core Z which is to be surrounded by a metal sheathing passes through the hollow mandrel h.

Theinvention is based on the following considerations: when the press cylinder is faces of the press pistons are at the same heat, as is e case with the well-known 488,462, and in Germany October 23, 1929.

presses, they meet during the pressing operation at the place of union of the currents of lead which are pressed out from the individual press cylinders and in this accumulated state they reach the wall of the pressed metal sheathing. As theaccumulation of the oxide particles which is caused by the subsequent filling of the press cylinders produces weak spots in the metal sheathing, the strength of the pressed metal sheathing is thereby reduced. If, as is the case according to the invention, the endsurfaces of the press pistons, and in order to initiate the pressing operation simultaneously by means of all the press pistons also the fillingopenings of the press cylinders are arranged at different heights, so that the distance between the end surfaces of the press pistons is the same as the distance between the filling openings of of the press cylinders, an accumulation of the oxide particles of the different currents of lead at one point is avoided and consequently the occurrence of weak spots in the metal sheathing is considerably reduced.

W'hat'I claim is A press with at least two press cylinders for the production of metal sheathings and tubes having press pistons the end surfaces of which are displaced relatively to one an other, the filling openings of the press cylinders being also displaced relatively to one another the displacement between the said end surfacesbeing the same as the displace- 

